TCFP Plans Examiner Practice Test

Heavy timber construction can be used for interior structural members in what type of construction?

1. Type III

2. Type IV

3. Type II

4. Type I

The correct answer is: Type IV

Heavy timber construction is specifically associated with Type IV construction, also known as "Heavy Timber" construction. This construction type utilizes large, solid wood members and is characterized by its substantial structural elements that provide significant fire resistance and structural integrity. In Type IV construction, the interior structural members can be heavy timber, which is defined by wood members that are at least 8 inches in dimension. This use of heavy timber supports the building's load while also allowing for certain fire resistance benefits, as the large size of the beams allows them to char on the outside without compromising structural strength. The other types of construction do not permit heavy timber as a primary structural element. Type I is typically made of non-combustible materials, Type II allows for some non-combustible materials but is generally restricted to lighter wood materials, and Type III construction generally incorporates wood framing but not heavy timber elements. Therefore, Type IV is uniquely suited to heavy timber construction and allows for its effective use in interior structural members.